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The pH of 0.5 M aqueous solution of HF (...

The pH of 0.5 M aqueous solution of HF `(K_(a)=2xx10^(-4))` is

A

2

B

4

C

6

D

10

Text Solution

Verified by Experts

The correct Answer is:
A
`[H^(+)] = sqrt(cK_(a)) = sqrt(0.5 xx 2xx 10^(-4)) = 10^(-2) M `
` pH = - log _(10) [H^(+) = - log 10^(-2) = 2 `
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